Fig. 1. Clear small samples of compression wood (CW) and normal wood (NW) from Masson pine samples

Fig. 2. Microfibril angles (MFAs) of the CW and NW from Masson pine samples

Fig. 3. FTIR spectra of the CW and NW from Masson pine samples

Fig. 4. FTIR spectra of different strains of a Masson pine wood
(b): C=O of lignin skeleton;(c): glycoside bond of cellulose;(d): CH₃C=O of xylan

Fig. 5. The wavenumber changes of the C—O—C of cellulose and C=O of lignin skeleton numberwave with the strain increase of the CN and NW samples

Fig. 6. The wavenumber changes of the —OH of cellulose intramolecular numberwave with the strain increase of the CN and NW samples

Fig. 7. The longitudinal tensile strain of cell wall at different microfibril angles MFAs

Fig. 8. The stress-strain curves of longitudinal tension and deformation mechanisms of the CW and NW samples